Polar Ordering of Macromolecular Chains in Composite Materials: Calcium Carbonate and Calcium Oxalate
| Autor: | Martin Sommer, Manuela Elena Stir, Matthias Burgener, Jürg Hulliger |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
food.ingredient 010405 organic chemistry Fluorapatite Composite number Calcium oxalate chemistry.chemical_element 02 engineering and technology General Chemistry Calcium 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Gelatin 0104 chemical sciences chemistry.chemical_compound Calcium carbonate Molecular recognition food chemistry General Materials Science Composite material 0210 nano-technology Macromolecule |
| Zdroj: | Crystal Growth & Design. 19:1592-1598 |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | The formation of composite materials is a fundamental process in nature. Fluorapatite (FAp) and calcium carbonate (CaCO3) grown in gelatin can be used as in vitro substitutes for biomimetic composite formation. Here we present our findings about polarity formation in CaCO3 composites grown in macromolecular gels such as gelatin, agar, and carrageenan, extending the analysis to another calcium mineral: calcium oxalate (CaC2O4). The grown spherical composites are investigated by scanning pyroelectric microscopy (SPEM), which allows a mapping of the polarity of a surface. SPEM measurements revealed bipolar structures for all measured composites, indicative of an underlying mechanism of molecular recognition leading to polar ordering of macromolecules. The process of polarity formation inside such composites can be explained by a Markov-type mechanism. The present results are compared to previously published data on FAp/gelatin composites, showing that they are similar. A new group of biomimetic materials was... |
| Databáze: | OpenAIRE |
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